Security PHP and MYSQL

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Job Description


My website is based on PHP + MYSQL. It got some CSS and JS.
However, someone is using software, and because it probably got alot of vulnerabilities. it is crashing the website and the database. (I guess there are some problems with XSS/CSS and PHP code itself)

I am looking for a php coder and security guy that can handle me this problem.

Thank you in advance.